@article{DE_1999_35_4_a9,
     author = {G. S. Tipenko},
     title = {Regularized traces of the {Hill} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {516--522},
     publisher = {mathdoc},
     volume = {35},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_4_a9/}
}